1. Rothausen, S. G. S. A. & Conway, D. Greenhouse-gas emissions from energy use in the water sector. Nature Clim. Change 1, 210–219 (2011).
2. King, C. W., Holman, A. S. & Webber, M. E. Thirst for energy. Nature Geosci 1, 283–286 (2008).
3. Hoff, H. Understanding the Nexus. Background Paper for the Bonn 2011 Conference: The Water, Energy and Food Security Nexus. (Stockholm Environ. Inst., Stockholm, 2011).
4. OECD/IEA. World Energy Outlook 2012. (Internat. Energy Agency, Paris, 2012).
5. International Energy Agency. Key world energy statistics. (Internat. Energy Agency, Paris, 2012).